Yes the steam booster boiler is damaged and a local gaggia repair agent should be able to repair it within an hour, they normally keep that part in stock.
I have EXACTLY the same problem. Thanks for helping out. Same thing, it happened after the descaling. One additional indicator: The prime light (I have the regular synchrony compact, not the digital model) was on constantly although water went thought the steam valve just fine. I got that resolved by just letting A LOT water run through.
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Clean an iron:
Service the steam and spray mechanism:
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